• Patch then:
• ./configure --prefix=/boot/common
• edit config.h and comment out the define for HAVE_MBRTOWC as pointed out by Kaliber on Haiku ticket # 3142.
• make
• make install

Cmake's dashboard is still failing the cvs test, but now it's a bit different than before:

Test output

Using CVS tools:
 cvs = /boot/common/bin/cvs
Creating test directory...
Creating repository...
Importing content...
Checking out revision 1...
Changing content...
Committing revision 2...
CMake Error at CTestUpdateCommon.cmake:13 (message):
  Child failed.  Output is

    cvs [commit aborted]: 'root' is not allowed to commit files

Call Stack (most recent call first):
  CTestUpdateCVS.cmake:73 (run_child)

So now we just need to figure out how to fix this one... Note that make check also fails this same test.